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Analog and digital ground; how to connect?

autodeskguest

Hi,

 

I have a circuit which uses an analog and digital ground.

 

These grounds must be connected at one point. How can i achieve this?

 

Note:

I created a dgnd and an agnd ; i connected these two symbols in the

schematic; it results in a net of agnd or dgnd; The electric rule check

results in an ERROR: .... overwritten with more than one signal .

 

 

Regards,

 

Johan

 

 

Parents

  • Familie Maas wrote:

    Hi,

     

    I have a circuit which uses an analog and digital ground.

     

    These grounds must be connected at one point. How can i achieve this?

     

    Note:

    I created a dgnd and an agnd ; i connected these two symbols in the

    schematic; it results in a net of agnd or dgnd; The electric rule

    check results in an ERROR: .... overwritten with more than one signal

    .

     

    Regards,

     

    Johan

     

    I've handled this by creating a library part with two pins in the schematic

    symbol.  For the footprint, I place two pads on top of each other (either

    SMT or through-hole).

     

    You can use this part in your schematic, connecting AGND to one pin and DGND

    to the other pin.  In the layout, you will neatly get the pad with an air

    wire to both AGND and DGND, but no other air wires between AGND and DGND.

     

    Of course, DRC will complain loudly about the overlapping pads.  I always

    look through the list of errors, and ignore the ones relating to the

    overlapping pads.

     

    --

    Bert Menkveld

     

     

     

Reply

  • Familie Maas wrote:

    Hi,

     

    I have a circuit which uses an analog and digital ground.

     

    These grounds must be connected at one point. How can i achieve this?

     

    Note:

    I created a dgnd and an agnd ; i connected these two symbols in the

    schematic; it results in a net of agnd or dgnd; The electric rule

    check results in an ERROR: .... overwritten with more than one signal

    .

     

    Regards,

     

    Johan

     

    I've handled this by creating a library part with two pins in the schematic

    symbol.  For the footprint, I place two pads on top of each other (either

    SMT or through-hole).

     

    You can use this part in your schematic, connecting AGND to one pin and DGND

    to the other pin.  In the layout, you will neatly get the pad with an air

    wire to both AGND and DGND, but no other air wires between AGND and DGND.

     

    Of course, DRC will complain loudly about the overlapping pads.  I always

    look through the list of errors, and ignore the ones relating to the

    overlapping pads.

     

    --

    Bert Menkveld

     

     

     

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